Committee Scope

Subcommittee 5, Tubular Goods (SC5)                        

API Staff Contact: Ben Coco (


SC5 develops, approves, and maintains standards pertaining and related to the product design and manufacture of:

  • casing/tubing and accessories for well operations
  • line pipe for transmission and facility piping
  • drill pipe and drill stem elements for drilling operations
  • pipe threading and gauging and thread compounds

The standards under SC5 are also supported with additional resources having expertise in metallurgy, performance properties, sour service, and coiled pipe

SC5 Advisory/Resource/Task Groups

  • Advisory Groups
    • Manufacturer (MAG)
    • User (UAG)
  • Resource Groups
    • Non-destructive Testing (RGNDT)
    • Performance Properties (RGPP)
    • Sour Service Products (RGSSP)
    • Coiled Tubulars (RGCT)
    • Monogram Program (RGMP)
  • Task Groups
    • Oil Country Tubular Goods (TGOCTG)​
    • Line Pipe (TGLP)
    • Drill Stem Elements (TGDSE)
    • Threading, Gauging, and Compounds (TGTGC)
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Ballot Information
NameSPEC 5CT, WI 2438, Notch depth tolerance and other characteristics
Start Date02/22/2021
Closing Date03/23/2021
AssociateBenjamin Coco
CoordinatorBenjamin Coco
ProposalTo collect actual notch depth data from undisclosed manufacturers and based on statistical analysis present to the group to negotiate new tolerance. To propose changes required in API 5CT for the notch depth and other characteristics, mainly the notch perpendicularity and control of the depth along the notch. The existing notch depth tolerance allows the same actual depth for different wall thickness hence the same inspection sensitivity for different products. Other notch characteristics like perpendicularity and depth control along the certified length—essential for a reference standard—are not covered in API 5CT 10th Edition.
ResultsIn Progress

Ballot Summary
Did Not Vote4 
Total Responses29 
Total Ballots33 
Response Rate87.88%Must be > 50%
Approval Rate85.71%Must be >= 66.67%
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